His administration issued tough new orders on Tuesday to begin a sweeping crackdown on undocumented immigrants, putting nearly all of the country's 11 million undocumented foreigners in target for deportation.

Two memos signed by the Department of Homeland Security Secretary John Kelly make it easier for officials to automatically expel undocumented immigrants.

They order border patrol and immigration officers to deport as quickly as possible any undocumented immigrants they find, with only a few exceptions, principally children.

Kelly and US Secretary of State Rex Tillerson are due to meet Mexican President Enrique Pena Nieto and other high level officials in Mexico this week.